Since I see that several people have read this thread, although not a soul has responded, I'll again update my own post.
The MAP sensor (turbo boost sensor) did not fix the problem and the CEL and P0089 came right back. So I undertook to replace the fuel pump module, which requires pulling off the heat shielding & dropping the fuel tank! Not my favourite job. It would not be bad if you had a hoist. However, it has now been about 10 days and many highway and city kms. with no sign of a CEL or code, so I think it is fixed. I have not yet done a post-mortem on the old pump, so can't tell you what went wrong. The new one is an OEM Bosch module (pump, filter, and fuel guage sender) from Rock Auto. The price was about $250 Can and their delivery speed is amazing-- about 4 days to Alberta! Cheers!
Hillhiker
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